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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_MEDIA_WEBRTC_WEBRTC_RTP_DUMP_HANDLER_H_
#define CHROME_BROWSER_MEDIA_WEBRTC_WEBRTC_RTP_DUMP_HANDLER_H_
#include <stddef.h>
#include <stdint.h>
#include <memory>
#include "base/callback.h"
#include "base/files/file_path.h"
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "base/sequence_checker.h"
#include "chrome/browser/media/webrtc/rtp_dump_type.h"
class WebRtcRtpDumpWriter;
// WebRtcRtpDumpHandler handles operations regarding the WebRTC RTP dump:
// - Starts or stops the RTP dumping on behalf of the client.
// - Stops the RTP dumping when the max dump file size is reached.
// - Writes the dump file.
// - Provides the dump file to the client code to be uploaded when
// ReleaseRtpDump is called.
// - Cleans up the dump file if not transferred to the client before the object
// is destroyed.
//
// Must be created/used/destroyed on the browser IO thread.
class WebRtcRtpDumpHandler {
public:
typedef base::Callback<void(bool, const std::string&)> GenericDoneCallback;
struct ReleasedDumps {
ReleasedDumps(const base::FilePath& incoming_dump,
const base::FilePath& outgoing_dump)
: incoming_dump_path(incoming_dump),
outgoing_dump_path(outgoing_dump) {}
const base::FilePath incoming_dump_path;
const base::FilePath outgoing_dump_path;
};
// The caller must make sure |dump_dir| exists. RTP dump files are saved under
// |dump_dir| as "rtpdump_$DIRECTION_$TIMESTAMP.gz", where $DIRECTION is
// 'send' for outgoing dump or 'recv' for incoming dump. $TIMESTAMP is the
// dump started time converted to a double number in microsecond precision,
// which should guarantee the uniqueness across tabs and dump streams in
// practice.
explicit WebRtcRtpDumpHandler(const base::FilePath& dump_dir);
~WebRtcRtpDumpHandler();
// Starts the specified type of dumping. Incoming/outgoing dumping can be
// started separately. Returns true if called in a valid state, i.e. the
// specified type of dump has not been started.
bool StartDump(RtpDumpType type, std::string* error_message);
// Stops the specified type of dumping. Incoming/outgoing dumping can be
// stopped separately. Returns asynchronously through |callback|, where
// |success| is true if StopDump is called in a valid state. The callback is
// called when the writer finishes writing the dumps.
void StopDump(RtpDumpType type, const GenericDoneCallback& callback);
// Returns true if it's valid to call ReleaseDumps, i.e. no dumping is ongoing
// or being stopped.
bool ReadyToRelease() const;
// Releases all the dumps and resets the state.
// It should only be called when both incoming and outgoing dumping has been
// stopped, i.e. ReadyToRelease() returns true. Returns the dump file paths.
//
// The caller will own the dump file after the method returns. If ReleaseDump
// is not called before this object goes away, the dump file will be deleted
// by this object.
ReleasedDumps ReleaseDumps();
// Adds an RTP packet to the dump. The caller must make sure it's a valid RTP
// packet.
void OnRtpPacket(const uint8_t* packet_header,
size_t header_length,
size_t packet_length,
bool incoming);
// Stops all ongoing dumps and call |callback| when finished.
void StopOngoingDumps(const base::Closure& callback);
private:
friend class WebRtcRtpDumpHandlerTest;
// State transitions:
// initial --> STATE_NONE
// StartDump --> STATE_STARTED
// StopDump --> STATE_STOPPED
// ReleaseDump --> STATE_RELEASING
// ReleaseDump done --> STATE_NONE
enum State {
STATE_NONE,
STATE_STARTED,
STATE_STOPPING,
STATE_STOPPED,
};
// For unit test to inject a fake writer.
void SetDumpWriterForTesting(std::unique_ptr<WebRtcRtpDumpWriter> writer);
// Callback from the dump writer when the max dump size is reached.
void OnMaxDumpSizeReached();
// Callback from the dump writer when ending dumps finishes. Calls |callback|
// when finished.
void OnDumpEnded(const base::Closure& callback,
RtpDumpType ended_type,
bool incoming_succeeded,
bool outgoing_succeeded);
SEQUENCE_CHECKER(main_sequence_);
// The absolute path to the directory containing the incoming/outgoing dumps.
const base::FilePath dump_dir_;
// The dump file paths.
base::FilePath incoming_dump_path_;
base::FilePath outgoing_dump_path_;
// The states of the incoming and outgoing dump.
State incoming_state_;
State outgoing_state_;
// The object used to create and write the dump file.
std::unique_ptr<WebRtcRtpDumpWriter> dump_writer_;
base::WeakPtrFactory<WebRtcRtpDumpHandler> weak_ptr_factory_{this};
DISALLOW_COPY_AND_ASSIGN(WebRtcRtpDumpHandler);
};
#endif // CHROME_BROWSER_MEDIA_WEBRTC_WEBRTC_RTP_DUMP_HANDLER_H_
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